Add XYZ Tiles Plugin (#960)

* Add initial xyz plugin

* update

* Update XYZ tiles

* comment update

* Add XYZTilesPlugin, share base implementation

* Remove log, delete origin DZI plugin

src/plugins/index.d.ts

@@ -11,7 +11,7 @@ export { BatchedTilesPlugin } from './three/batched/BatchedTilesPlugin';
 export * from './three/DebugTilesPlugin';
 
 // other formats
-export { DeepZoomImagePlugin } from './three/DeepZoomImagePlugin';
+export * from './three/ImageFormatPlugin';
 
 // common plugins
 export { ImplicitTilingPlugin } from './base/ImplicitTilingPlugin';

src/plugins/index.js

@@ -11,7 +11,7 @@ export { BatchedTilesPlugin } from './three/batched/BatchedTilesPlugin.js';
 export * from './three/DebugTilesPlugin.js';
 
 // other formats
-export { DeepZoomImagePlugin } from './three/DeepZoomImagePlugin.js';
+export * from './three/ImageFormatPlugin.js';
 
 // common plugins
 export { ImplicitTilingPlugin } from './base/ImplicitTilingPlugin.js';

src/plugins/three/ImageFormatPlugin.d.ts

@@ -0,0 +1,19 @@
+export class DeepZoomImagePlugin {
+
+	constructor( options: {
+		center?: boolean,
+		pixelSize?: number,
+	} );
+
+}
+
+export class XYZTilesPlugin {
+
+	constructor( options: {
+		center?: boolean,
+		pixelSize?: number,
+		levels?: number,
+		tileDimension?: number,
+	} );
+
+}